When clicking Add Closure, it makes sense that the cursor automatically populates the Description text box ready for text entry - I'd guess that most editors would make the entry of a closure description the first thing they do when adding a closure, and it's becoming irrationally annoying having to click the text box to do this!

(Even more so now that there's a huge mouse journey from clicking the Closures tab right at the top, to the Add Closure button right at the bottom, back up to the Description box right at the top again.)